20012501191 has 2 divisors, whose sum is σ = 20012501192. Its totient is φ = 20012501190.

The previous prime is 20012501111. The next prime is 20012501291. The reversal of 20012501191 is 19110521002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20012501191 - 2¹⁹ = 20011976903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20012501101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006250595 + 10006250596.

It is an arithmetic number, because the mean of its divisors is an integer number (10006250596).

Almost surely, 2^20012501191 is an apocalyptic number.

20012501191 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012501191 is an equidigital number, since it uses as much as digits as its factorization.

20012501191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 22.

The spelling of 20012501191 in words is "twenty billion, twelve million, five hundred one thousand, one hundred ninety-one".